The BMW X6 has been a runaway success. What does this mean? It means Audi and Mercedes are upset they didn't think of it first. Mercedes announced their intention to compete with the X6 with the GLS. The GLS will simply be a sportier version of the ML platform sharing components and motors just like the X6 does with the X5. A Mecedes spokesperson stated, “After closely monitoring sales trends, we’ve concluded there is potential for an additional off-road model with a more sporting emphasis than the new M-class.”